blob: c5eff52094f0522dfb3d31262b97788995e9e592 [file] [log] [blame]
/*
* (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2000 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "core/rendering/InlineTextBox.h"
#include "core/dom/Document.h"
#include "core/dom/DocumentMarkerController.h"
#include "core/dom/RenderedDocumentMarker.h"
#include "core/dom/Text.h"
#include "core/editing/Editor.h"
#include "core/editing/InputMethodController.h"
#include "core/frame/Frame.h"
#include "core/page/Page.h"
#include "core/page/Settings.h"
#include "core/platform/graphics/FontCache.h"
#include "core/platform/graphics/GraphicsContextStateSaver.h"
#include "core/platform/graphics/WidthIterator.h"
#include "core/rendering/AbstractInlineTextBox.h"
#include "core/rendering/EllipsisBox.h"
#include "core/rendering/HitTestResult.h"
#include "core/rendering/PaintInfo.h"
#include "core/rendering/RenderBR.h"
#include "core/rendering/RenderBlock.h"
#include "core/rendering/RenderCombineText.h"
#include "core/rendering/RenderRubyRun.h"
#include "core/rendering/RenderRubyText.h"
#include "core/rendering/RenderTheme.h"
#include "core/rendering/style/ShadowList.h"
#include "core/rendering/svg/SVGTextRunRenderingContext.h"
#include "platform/graphics/DrawLooper.h"
#include "wtf/Vector.h"
#include "wtf/text/CString.h"
#include "wtf/text/StringBuilder.h"
using namespace std;
namespace WebCore {
struct SameSizeAsInlineTextBox : public InlineBox {
unsigned variables[1];
unsigned short variables2[2];
void* pointers[2];
};
COMPILE_ASSERT(sizeof(InlineTextBox) == sizeof(SameSizeAsInlineTextBox), InlineTextBox_should_stay_small);
typedef WTF::HashMap<const InlineTextBox*, LayoutRect> InlineTextBoxOverflowMap;
static InlineTextBoxOverflowMap* gTextBoxesWithOverflow;
static const int misspellingLineThickness = 3;
void InlineTextBox::destroy()
{
AbstractInlineTextBox::willDestroy(this);
if (!knownToHaveNoOverflow() && gTextBoxesWithOverflow)
gTextBoxesWithOverflow->remove(this);
InlineBox::destroy();
}
void InlineTextBox::markDirty(bool dirty)
{
if (dirty) {
m_len = 0;
m_start = 0;
}
InlineBox::markDirty(dirty);
}
LayoutRect InlineTextBox::logicalOverflowRect() const
{
if (knownToHaveNoOverflow() || !gTextBoxesWithOverflow)
return enclosingIntRect(logicalFrameRect());
return gTextBoxesWithOverflow->get(this);
}
void InlineTextBox::setLogicalOverflowRect(const LayoutRect& rect)
{
ASSERT(!knownToHaveNoOverflow());
if (!gTextBoxesWithOverflow)
gTextBoxesWithOverflow = new InlineTextBoxOverflowMap;
gTextBoxesWithOverflow->add(this, rect);
}
int InlineTextBox::baselinePosition(FontBaseline baselineType) const
{
if (!isText() || !parent())
return 0;
if (parent()->renderer() == renderer()->parent())
return parent()->baselinePosition(baselineType);
return toRenderBoxModelObject(renderer()->parent())->baselinePosition(baselineType, isFirstLineStyle(), isHorizontal() ? HorizontalLine : VerticalLine, PositionOnContainingLine);
}
LayoutUnit InlineTextBox::lineHeight() const
{
if (!isText() || !renderer()->parent())
return 0;
if (m_renderer->isBR())
return toRenderBR(m_renderer)->lineHeight(isFirstLineStyle());
if (parent()->renderer() == renderer()->parent())
return parent()->lineHeight();
return toRenderBoxModelObject(renderer()->parent())->lineHeight(isFirstLineStyle(), isHorizontal() ? HorizontalLine : VerticalLine, PositionOnContainingLine);
}
LayoutUnit InlineTextBox::selectionTop()
{
return root()->selectionTop();
}
LayoutUnit InlineTextBox::selectionBottom()
{
return root()->selectionBottom();
}
LayoutUnit InlineTextBox::selectionHeight()
{
return root()->selectionHeight();
}
bool InlineTextBox::isSelected(int startPos, int endPos) const
{
int sPos = max(startPos - m_start, 0);
// The position after a hard line break is considered to be past its end.
// See the corresponding code in InlineTextBox::selectionState.
int ePos = min(endPos - m_start, int(m_len) + (isLineBreak() ? 0 : 1));
return (sPos < ePos);
}
RenderObject::SelectionState InlineTextBox::selectionState()
{
RenderObject::SelectionState state = renderer()->selectionState();
if (state == RenderObject::SelectionStart || state == RenderObject::SelectionEnd || state == RenderObject::SelectionBoth) {
int startPos, endPos;
renderer()->selectionStartEnd(startPos, endPos);
// The position after a hard line break is considered to be past its end.
// See the corresponding code in InlineTextBox::isSelected.
int lastSelectable = start() + len() - (isLineBreak() ? 1 : 0);
// FIXME: Remove -webkit-line-break: LineBreakAfterWhiteSpace.
int endOfLineAdjustmentForCSSLineBreak = renderer()->style()->lineBreak() == LineBreakAfterWhiteSpace ? -1 : 0;
bool start = (state != RenderObject::SelectionEnd && startPos >= m_start && startPos <= m_start + m_len + endOfLineAdjustmentForCSSLineBreak);
bool end = (state != RenderObject::SelectionStart && endPos > m_start && endPos <= lastSelectable);
if (start && end)
state = RenderObject::SelectionBoth;
else if (start)
state = RenderObject::SelectionStart;
else if (end)
state = RenderObject::SelectionEnd;
else if ((state == RenderObject::SelectionEnd || startPos < m_start) &&
(state == RenderObject::SelectionStart || endPos > lastSelectable))
state = RenderObject::SelectionInside;
else if (state == RenderObject::SelectionBoth)
state = RenderObject::SelectionNone;
}
// If there are ellipsis following, make sure their selection is updated.
if (m_truncation != cNoTruncation && root()->ellipsisBox()) {
EllipsisBox* ellipsis = root()->ellipsisBox();
if (state != RenderObject::SelectionNone) {
int start, end;
selectionStartEnd(start, end);
// The ellipsis should be considered to be selected if the end of
// the selection is past the beginning of the truncation and the
// beginning of the selection is before or at the beginning of the
// truncation.
ellipsis->setSelectionState(end >= m_truncation && start <= m_truncation ?
RenderObject::SelectionInside : RenderObject::SelectionNone);
} else
ellipsis->setSelectionState(RenderObject::SelectionNone);
}
return state;
}
LayoutRect InlineTextBox::localSelectionRect(int startPos, int endPos)
{
int sPos = max(startPos - m_start, 0);
int ePos = min(endPos - m_start, (int)m_len);
if (sPos > ePos)
return LayoutRect();
FontCachePurgePreventer fontCachePurgePreventer;
RenderText* textObj = textRenderer();
LayoutUnit selTop = selectionTop();
LayoutUnit selHeight = selectionHeight();
RenderStyle* styleToUse = textObj->style(isFirstLineStyle());
const Font& font = styleToUse->font();
StringBuilder charactersWithHyphen;
bool respectHyphen = ePos == m_len && hasHyphen();
TextRun textRun = constructTextRun(styleToUse, font, respectHyphen ? &charactersWithHyphen : 0);
if (respectHyphen)
endPos = textRun.length();
FloatPoint startingPoint = FloatPoint(logicalLeft(), selTop);
LayoutRect r;
if (sPos || ePos != static_cast<int>(m_len))
r = enclosingIntRect(font.selectionRectForText(textRun, startingPoint, selHeight, sPos, ePos));
else // Avoid computing the font width when the entire line box is selected as an optimization.
r = enclosingIntRect(FloatRect(startingPoint, FloatSize(m_logicalWidth, selHeight)));
LayoutUnit logicalWidth = r.width();
if (r.x() > logicalRight())
logicalWidth = 0;
else if (r.maxX() > logicalRight())
logicalWidth = logicalRight() - r.x();
LayoutPoint topPoint = isHorizontal() ? LayoutPoint(r.x(), selTop) : LayoutPoint(selTop, r.x());
LayoutUnit width = isHorizontal() ? logicalWidth : selHeight;
LayoutUnit height = isHorizontal() ? selHeight : logicalWidth;
return LayoutRect(topPoint, LayoutSize(width, height));
}
void InlineTextBox::deleteLine()
{
toRenderText(renderer())->removeTextBox(this);
destroy();
}
void InlineTextBox::extractLine()
{
if (extracted())
return;
toRenderText(renderer())->extractTextBox(this);
}
void InlineTextBox::attachLine()
{
if (!extracted())
return;
toRenderText(renderer())->attachTextBox(this);
}
float InlineTextBox::placeEllipsisBox(bool flowIsLTR, float visibleLeftEdge, float visibleRightEdge, float ellipsisWidth, float &truncatedWidth, bool& foundBox)
{
if (foundBox) {
m_truncation = cFullTruncation;
return -1;
}
// For LTR this is the left edge of the box, for RTL, the right edge in parent coordinates.
float ellipsisX = flowIsLTR ? visibleRightEdge - ellipsisWidth : visibleLeftEdge + ellipsisWidth;
// Criteria for full truncation:
// LTR: the left edge of the ellipsis is to the left of our text run.
// RTL: the right edge of the ellipsis is to the right of our text run.
bool ltrFullTruncation = flowIsLTR && ellipsisX <= left();
bool rtlFullTruncation = !flowIsLTR && ellipsisX >= left() + logicalWidth();
if (ltrFullTruncation || rtlFullTruncation) {
// Too far. Just set full truncation, but return -1 and let the ellipsis just be placed at the edge of the box.
m_truncation = cFullTruncation;
foundBox = true;
return -1;
}
bool ltrEllipsisWithinBox = flowIsLTR && (ellipsisX < right());
bool rtlEllipsisWithinBox = !flowIsLTR && (ellipsisX > left());
if (ltrEllipsisWithinBox || rtlEllipsisWithinBox) {
foundBox = true;
// The inline box may have different directionality than it's parent. Since truncation
// behavior depends both on both the parent and the inline block's directionality, we
// must keep track of these separately.
bool ltr = isLeftToRightDirection();
if (ltr != flowIsLTR) {
// Width in pixels of the visible portion of the box, excluding the ellipsis.
int visibleBoxWidth = visibleRightEdge - visibleLeftEdge - ellipsisWidth;
ellipsisX = ltr ? left() + visibleBoxWidth : right() - visibleBoxWidth;
}
int offset = offsetForPosition(ellipsisX, false);
if (offset == 0) {
// No characters should be rendered. Set ourselves to full truncation and place the ellipsis at the min of our start
// and the ellipsis edge.
m_truncation = cFullTruncation;
truncatedWidth += ellipsisWidth;
return min(ellipsisX, x());
}
// Set the truncation index on the text run.
m_truncation = offset;
// If we got here that means that we were only partially truncated and we need to return the pixel offset at which
// to place the ellipsis.
float widthOfVisibleText = toRenderText(renderer())->width(m_start, offset, textPos(), isFirstLineStyle());
// The ellipsis needs to be placed just after the last visible character.
// Where "after" is defined by the flow directionality, not the inline
// box directionality.
// e.g. In the case of an LTR inline box truncated in an RTL flow then we can
// have a situation such as |Hello| -> |...He|
truncatedWidth += widthOfVisibleText + ellipsisWidth;
if (flowIsLTR)
return left() + widthOfVisibleText;
else
return right() - widthOfVisibleText - ellipsisWidth;
}
truncatedWidth += logicalWidth();
return -1;
}
Color correctedTextColor(Color textColor, Color backgroundColor)
{
// Adjust the text color if it is too close to the background color,
// by darkening or lightening it to move it further away.
int d = differenceSquared(textColor, backgroundColor);
// semi-arbitrarily chose 65025 (255^2) value here after a few tests;
if (d > 65025) {
return textColor;
}
int distanceFromWhite = differenceSquared(textColor, Color::white);
int distanceFromBlack = differenceSquared(textColor, Color::black);
if (distanceFromWhite < distanceFromBlack) {
return textColor.dark();
}
return textColor.light();
}
void updateGraphicsContext(GraphicsContext* context, const Color& fillColor, const Color& strokeColor, float strokeThickness)
{
TextDrawingModeFlags mode = context->textDrawingMode();
if (strokeThickness > 0) {
TextDrawingModeFlags newMode = mode | TextModeStroke;
if (mode != newMode) {
context->setTextDrawingMode(newMode);
mode = newMode;
}
}
if (mode & TextModeFill && fillColor != context->fillColor())
context->setFillColor(fillColor);
if (mode & TextModeStroke) {
if (strokeColor != context->strokeColor())
context->setStrokeColor(strokeColor);
if (strokeThickness != context->strokeThickness())
context->setStrokeThickness(strokeThickness);
}
}
bool InlineTextBox::isLineBreak() const
{
return renderer()->isBR() || (renderer()->style()->preserveNewline() && len() == 1 && (*textRenderer()->text().impl())[start()] == '\n');
}
bool InlineTextBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit /* lineTop */, LayoutUnit /*lineBottom*/)
{
if (isLineBreak())
return false;
FloatPoint boxOrigin = locationIncludingFlipping();
boxOrigin.moveBy(accumulatedOffset);
FloatRect rect(boxOrigin, size());
if (m_truncation != cFullTruncation && visibleToHitTestRequest(request) && locationInContainer.intersects(rect)) {
renderer()->updateHitTestResult(result, flipForWritingMode(locationInContainer.point() - toLayoutSize(accumulatedOffset)));
if (!result.addNodeToRectBasedTestResult(renderer()->node(), request, locationInContainer, rect))
return true;
}
return false;
}
static void paintTextWithShadows(GraphicsContext* context,
const RenderObject* renderer, const Font& font, const TextRun& textRun,
const AtomicString& emphasisMark, int emphasisMarkOffset,
int startOffset, int endOffset, int truncationPoint,
const FloatPoint& textOrigin, const FloatRect& boxRect,
const ShadowList* shadowList, bool stroked, bool horizontal)
{
// Text shadows are disabled when printing. http://crbug.com/258321
bool hasShadow = shadowList && !context->printing();
if (hasShadow) {
DrawLooper drawLooper;
for (size_t i = shadowList->shadows().size(); i--; ) {
const ShadowData& shadow = shadowList->shadows()[i];
int shadowX = horizontal ? shadow.x() : shadow.y();
int shadowY = horizontal ? shadow.y() : -shadow.x();
FloatSize offset(shadowX, shadowY);
drawLooper.addShadow(offset, shadow.blur(), renderer->resolveColor(shadow.color()),
DrawLooper::ShadowRespectsTransforms, DrawLooper::ShadowIgnoresAlpha);
}
drawLooper.addUnmodifiedContent();
context->setDrawLooper(drawLooper);
}
TextRunPaintInfo textRunPaintInfo(textRun);
textRunPaintInfo.bounds = boxRect;
if (startOffset <= endOffset) {
textRunPaintInfo.from = startOffset;
textRunPaintInfo.to = endOffset;
if (emphasisMark.isEmpty())
context->drawText(font, textRunPaintInfo, textOrigin);
else
context->drawEmphasisMarks(font, textRunPaintInfo, emphasisMark, textOrigin + IntSize(0, emphasisMarkOffset));
} else {
if (endOffset > 0) {
textRunPaintInfo.from = 0;
textRunPaintInfo.to = endOffset;
if (emphasisMark.isEmpty())
context->drawText(font, textRunPaintInfo, textOrigin);
else
context->drawEmphasisMarks(font, textRunPaintInfo, emphasisMark, textOrigin + IntSize(0, emphasisMarkOffset));
}
if (startOffset < truncationPoint) {
textRunPaintInfo.from = startOffset;
textRunPaintInfo.to = truncationPoint;
if (emphasisMark.isEmpty())
context->drawText(font, textRunPaintInfo, textOrigin);
else
context->drawEmphasisMarks(font, textRunPaintInfo, emphasisMark, textOrigin + IntSize(0, emphasisMarkOffset));
}
}
if (hasShadow)
context->clearDrawLooper();
}
bool InlineTextBox::getEmphasisMarkPosition(RenderStyle* style, TextEmphasisPosition& emphasisPosition) const
{
// This function returns true if there are text emphasis marks and they are suppressed by ruby text.
if (style->textEmphasisMark() == TextEmphasisMarkNone)
return false;
emphasisPosition = style->textEmphasisPosition();
if (emphasisPosition == TextEmphasisPositionUnder)
return true; // Ruby text is always over, so it cannot suppress emphasis marks under.
RenderBlock* containingBlock = renderer()->containingBlock();
if (!containingBlock->isRubyBase())
return true; // This text is not inside a ruby base, so it does not have ruby text over it.
if (!containingBlock->parent()->isRubyRun())
return true; // Cannot get the ruby text.
RenderRubyText* rubyText = toRenderRubyRun(containingBlock->parent())->rubyText();
// The emphasis marks over are suppressed only if there is a ruby text box and it not empty.
return !rubyText || !rubyText->firstLineBox();
}
enum RotationDirection { Counterclockwise, Clockwise };
static inline AffineTransform rotation(const FloatRect& boxRect, RotationDirection clockwise)
{
return clockwise ? AffineTransform(0, 1, -1, 0, boxRect.x() + boxRect.maxY(), boxRect.maxY() - boxRect.x())
: AffineTransform(0, -1, 1, 0, boxRect.x() - boxRect.maxY(), boxRect.x() + boxRect.maxY());
}
void InlineTextBox::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset, LayoutUnit /*lineTop*/, LayoutUnit /*lineBottom*/)
{
if (isLineBreak() || !paintInfo.shouldPaintWithinRoot(renderer()) || renderer()->style()->visibility() != VISIBLE ||
m_truncation == cFullTruncation || paintInfo.phase == PaintPhaseOutline || !m_len)
return;
ASSERT(paintInfo.phase != PaintPhaseSelfOutline && paintInfo.phase != PaintPhaseChildOutlines);
LayoutUnit logicalLeftSide = logicalLeftVisualOverflow();
LayoutUnit logicalRightSide = logicalRightVisualOverflow();
LayoutUnit logicalStart = logicalLeftSide + (isHorizontal() ? paintOffset.x() : paintOffset.y());
LayoutUnit logicalExtent = logicalRightSide - logicalLeftSide;
LayoutUnit paintEnd = isHorizontal() ? paintInfo.rect.maxX() : paintInfo.rect.maxY();
LayoutUnit paintStart = isHorizontal() ? paintInfo.rect.x() : paintInfo.rect.y();
LayoutPoint adjustedPaintOffset = roundedIntPoint(paintOffset);
if (logicalStart >= paintEnd || logicalStart + logicalExtent <= paintStart)
return;
bool isPrinting = textRenderer()->document().printing();
// Determine whether or not we're selected.
bool haveSelection = !isPrinting && paintInfo.phase != PaintPhaseTextClip && selectionState() != RenderObject::SelectionNone;
if (!haveSelection && paintInfo.phase == PaintPhaseSelection)
// When only painting the selection, don't bother to paint if there is none.
return;
if (m_truncation != cNoTruncation) {
if (renderer()->containingBlock()->style()->isLeftToRightDirection() != isLeftToRightDirection()) {
// Make the visible fragment of text hug the edge closest to the rest of the run by moving the origin
// at which we start drawing text.
// e.g. In the case of LTR text truncated in an RTL Context, the correct behavior is:
// |Hello|CBA| -> |...He|CBA|
// In order to draw the fragment "He" aligned to the right edge of it's box, we need to start drawing
// farther to the right.
// NOTE: WebKit's behavior differs from that of IE which appears to just overlay the ellipsis on top of the
// truncated string i.e. |Hello|CBA| -> |...lo|CBA|
LayoutUnit widthOfVisibleText = toRenderText(renderer())->width(m_start, m_truncation, textPos(), isFirstLineStyle());
LayoutUnit widthOfHiddenText = m_logicalWidth - widthOfVisibleText;
// FIXME: The hit testing logic also needs to take this translation into account.
LayoutSize truncationOffset(isLeftToRightDirection() ? widthOfHiddenText : -widthOfHiddenText, 0);
adjustedPaintOffset.move(isHorizontal() ? truncationOffset : truncationOffset.transposedSize());
}
}
GraphicsContext* context = paintInfo.context;
RenderObject* rendererToUse = renderer();
RenderStyle* styleToUse = rendererToUse->style(isFirstLineStyle());
adjustedPaintOffset.move(0, styleToUse->isHorizontalWritingMode() ? 0 : -logicalHeight());
FloatPoint boxOrigin = locationIncludingFlipping();
boxOrigin.move(adjustedPaintOffset.x(), adjustedPaintOffset.y());
FloatRect boxRect(boxOrigin, LayoutSize(logicalWidth(), logicalHeight()));
RenderCombineText* combinedText = styleToUse->hasTextCombine() && textRenderer()->isCombineText() && toRenderCombineText(textRenderer())->isCombined() ? toRenderCombineText(textRenderer()) : 0;
bool shouldRotate = !isHorizontal() && !combinedText;
if (shouldRotate)
context->concatCTM(rotation(boxRect, Clockwise));
// Determine whether or not we have composition underlines to draw.
bool containsComposition = renderer()->node() && renderer()->frame()->inputMethodController().compositionNode() == renderer()->node();
bool useCustomUnderlines = containsComposition && renderer()->frame()->inputMethodController().compositionUsesCustomUnderlines();
// Determine the text colors and selection colors.
Color textFillColor;
Color textStrokeColor;
Color emphasisMarkColor;
float textStrokeWidth = styleToUse->textStrokeWidth();
// Text shadows are disabled when printing. http://crbug.com/258321
const ShadowList* textShadow = (context->printing() || paintInfo.forceBlackText()) ? 0 : styleToUse->textShadow();
if (paintInfo.forceBlackText()) {
textFillColor = Color::black;
textStrokeColor = Color::black;
emphasisMarkColor = Color::black;
} else {
textFillColor = rendererToUse->resolveColor(styleToUse, CSSPropertyWebkitTextFillColor);
bool forceBackgroundToWhite = false;
if (isPrinting) {
if (styleToUse->printColorAdjust() == PrintColorAdjustEconomy)
forceBackgroundToWhite = true;
if (textRenderer()->document().settings() && textRenderer()->document().settings()->shouldPrintBackgrounds())
forceBackgroundToWhite = false;
}
// Make the text fill color legible against a white background
if (forceBackgroundToWhite)
textFillColor = correctedTextColor(textFillColor, Color::white);
textStrokeColor = rendererToUse->resolveColor(styleToUse, CSSPropertyWebkitTextStrokeColor);
// Make the text stroke color legible against a white background
if (forceBackgroundToWhite)
textStrokeColor = correctedTextColor(textStrokeColor, Color::white);
emphasisMarkColor = rendererToUse->resolveColor(styleToUse, CSSPropertyWebkitTextEmphasisColor);
// Make the text stroke color legible against a white background
if (forceBackgroundToWhite)
emphasisMarkColor = correctedTextColor(emphasisMarkColor, Color::white);
}
bool paintSelectedTextOnly = (paintInfo.phase == PaintPhaseSelection);
bool paintSelectedTextSeparately = false;
Color selectionFillColor = textFillColor;
Color selectionStrokeColor = textStrokeColor;
Color selectionEmphasisMarkColor = emphasisMarkColor;
float selectionStrokeWidth = textStrokeWidth;
const ShadowList* selectionShadow = textShadow;
if (haveSelection) {
// Check foreground color first.
Color foreground = paintInfo.forceBlackText() ? Color::black : renderer()->selectionForegroundColor();
if (foreground.isValid() && foreground != selectionFillColor && foreground != Color::transparent) {
if (!paintSelectedTextOnly)
paintSelectedTextSeparately = true;
selectionFillColor = foreground;
}
Color emphasisMarkForeground = paintInfo.forceBlackText() ? Color::black : renderer()->selectionEmphasisMarkColor();
if (emphasisMarkForeground.isValid() && emphasisMarkForeground != selectionEmphasisMarkColor) {
if (!paintSelectedTextOnly)
paintSelectedTextSeparately = true;
selectionEmphasisMarkColor = emphasisMarkForeground;
}
if (RenderStyle* pseudoStyle = renderer()->getCachedPseudoStyle(SELECTION)) {
// Text shadows are disabled when printing. http://crbug.com/258321
const ShadowList* shadow = (context->printing() || paintInfo.forceBlackText()) ? 0 : pseudoStyle->textShadow();
if (shadow != selectionShadow) {
if (!paintSelectedTextOnly)
paintSelectedTextSeparately = true;
selectionShadow = shadow;
}
float strokeWidth = pseudoStyle->textStrokeWidth();
if (strokeWidth != selectionStrokeWidth) {
if (!paintSelectedTextOnly)
paintSelectedTextSeparately = true;
selectionStrokeWidth = strokeWidth;
}
Color stroke = paintInfo.forceBlackText() ? Color::black : rendererToUse->resolveColor(pseudoStyle, CSSPropertyWebkitTextStrokeColor);
if (stroke != selectionStrokeColor) {
if (!paintSelectedTextOnly)
paintSelectedTextSeparately = true;
selectionStrokeColor = stroke;
}
}
}
// Set our font.
const Font& font = styleToUse->font();
FloatPoint textOrigin = FloatPoint(boxOrigin.x(), boxOrigin.y() + font.fontMetrics().ascent());
if (combinedText)
combinedText->adjustTextOrigin(textOrigin, boxRect);
// 1. Paint backgrounds behind text if needed. Examples of such backgrounds include selection
// and composition underlines.
if (paintInfo.phase != PaintPhaseSelection && paintInfo.phase != PaintPhaseTextClip && !isPrinting) {
if (containsComposition && !useCustomUnderlines) {
paintCompositionBackground(context, boxOrigin, styleToUse, font,
renderer()->frame()->inputMethodController().compositionStart(),
renderer()->frame()->inputMethodController().compositionEnd());
}
paintDocumentMarkers(context, boxOrigin, styleToUse, font, true);
if (haveSelection && !useCustomUnderlines)
paintSelection(context, boxOrigin, styleToUse, font, selectionFillColor);
}
// 2. Now paint the foreground, including text and decorations like underline/overline (in quirks mode only).
int length = m_len;
int maximumLength;
StringView string;
if (!combinedText) {
string = textRenderer()->text().createView();
if (static_cast<unsigned>(length) != string.length() || m_start)
string.narrow(m_start, length);
maximumLength = textRenderer()->textLength() - m_start;
} else {
combinedText->getStringToRender(m_start, string, length);
maximumLength = length;
}
StringBuilder charactersWithHyphen;
TextRun textRun = constructTextRun(styleToUse, font, string, maximumLength, hasHyphen() ? &charactersWithHyphen : 0);
if (hasHyphen())
length = textRun.length();
int sPos = 0;
int ePos = 0;
if (paintSelectedTextOnly || paintSelectedTextSeparately)
selectionStartEnd(sPos, ePos);
if (m_truncation != cNoTruncation) {
sPos = min<int>(sPos, m_truncation);
ePos = min<int>(ePos, m_truncation);
length = m_truncation;
}
int emphasisMarkOffset = 0;
TextEmphasisPosition emphasisMarkPosition;
bool hasTextEmphasis = getEmphasisMarkPosition(styleToUse, emphasisMarkPosition);
const AtomicString& emphasisMark = hasTextEmphasis ? styleToUse->textEmphasisMarkString() : nullAtom;
if (!emphasisMark.isEmpty())
emphasisMarkOffset = emphasisMarkPosition == TextEmphasisPositionOver ? -font.fontMetrics().ascent() - font.emphasisMarkDescent(emphasisMark) : font.fontMetrics().descent() + font.emphasisMarkAscent(emphasisMark);
if (!paintSelectedTextOnly) {
// For stroked painting, we have to change the text drawing mode. It's probably dangerous to leave that mutated as a side
// effect, so only when we know we're stroking, do a save/restore.
GraphicsContextStateSaver stateSaver(*context, textStrokeWidth > 0);
updateGraphicsContext(context, textFillColor, textStrokeColor, textStrokeWidth);
if (!paintSelectedTextSeparately || ePos <= sPos) {
// FIXME: Truncate right-to-left text correctly.
paintTextWithShadows(context, rendererToUse, font, textRun, nullAtom, 0, 0, length, length, textOrigin, boxRect, textShadow, textStrokeWidth > 0, isHorizontal());
} else {
paintTextWithShadows(context, rendererToUse, font, textRun, nullAtom, 0, ePos, sPos, length, textOrigin, boxRect, textShadow, textStrokeWidth > 0, isHorizontal());
}
if (!emphasisMark.isEmpty()) {
updateGraphicsContext(context, emphasisMarkColor, textStrokeColor, textStrokeWidth);
DEFINE_STATIC_LOCAL(TextRun, objectReplacementCharacterTextRun, (&objectReplacementCharacter, 1));
TextRun& emphasisMarkTextRun = combinedText ? objectReplacementCharacterTextRun : textRun;
FloatPoint emphasisMarkTextOrigin = combinedText ? FloatPoint(boxOrigin.x() + boxRect.width() / 2, boxOrigin.y() + font.fontMetrics().ascent()) : textOrigin;
if (combinedText)
context->concatCTM(rotation(boxRect, Clockwise));
if (!paintSelectedTextSeparately || ePos <= sPos) {
// FIXME: Truncate right-to-left text correctly.
paintTextWithShadows(context, rendererToUse, combinedText ? combinedText->originalFont() : font, emphasisMarkTextRun, emphasisMark, emphasisMarkOffset, 0, length, length, emphasisMarkTextOrigin, boxRect, textShadow, textStrokeWidth > 0, isHorizontal());
} else {
paintTextWithShadows(context, rendererToUse, combinedText ? combinedText->originalFont() : font, emphasisMarkTextRun, emphasisMark, emphasisMarkOffset, ePos, sPos, length, emphasisMarkTextOrigin, boxRect, textShadow, textStrokeWidth > 0, isHorizontal());
}
if (combinedText)
context->concatCTM(rotation(boxRect, Counterclockwise));
}
}
if ((paintSelectedTextOnly || paintSelectedTextSeparately) && sPos < ePos) {
// paint only the text that is selected
GraphicsContextStateSaver stateSaver(*context, selectionStrokeWidth > 0);
updateGraphicsContext(context, selectionFillColor, selectionStrokeColor, selectionStrokeWidth);
paintTextWithShadows(context, rendererToUse, font, textRun, nullAtom, 0, sPos, ePos, length, textOrigin, boxRect, selectionShadow, selectionStrokeWidth > 0, isHorizontal());
if (!emphasisMark.isEmpty()) {
updateGraphicsContext(context, selectionEmphasisMarkColor, textStrokeColor, textStrokeWidth);
DEFINE_STATIC_LOCAL(TextRun, objectReplacementCharacterTextRun, (&objectReplacementCharacter, 1));
TextRun& emphasisMarkTextRun = combinedText ? objectReplacementCharacterTextRun : textRun;
FloatPoint emphasisMarkTextOrigin = combinedText ? FloatPoint(boxOrigin.x() + boxRect.width() / 2, boxOrigin.y() + font.fontMetrics().ascent()) : textOrigin;
if (combinedText)
context->concatCTM(rotation(boxRect, Clockwise));
paintTextWithShadows(context, rendererToUse, combinedText ? combinedText->originalFont() : font, emphasisMarkTextRun, emphasisMark, emphasisMarkOffset, sPos, ePos, length, emphasisMarkTextOrigin, boxRect, selectionShadow, selectionStrokeWidth > 0, isHorizontal());
if (combinedText)
context->concatCTM(rotation(boxRect, Counterclockwise));
}
}
// Paint decorations
TextDecoration textDecorations = styleToUse->textDecorationsInEffect();
if (textDecorations != TextDecorationNone && paintInfo.phase != PaintPhaseSelection) {
updateGraphicsContext(context, textFillColor, textStrokeColor, textStrokeWidth);
if (combinedText)
context->concatCTM(rotation(boxRect, Clockwise));
paintDecoration(context, boxOrigin, textDecorations, styleToUse->textDecorationStyle(), textShadow);
if (combinedText)
context->concatCTM(rotation(boxRect, Counterclockwise));
}
if (paintInfo.phase == PaintPhaseForeground) {
paintDocumentMarkers(context, boxOrigin, styleToUse, font, false);
if (useCustomUnderlines) {
const Vector<CompositionUnderline>& underlines = renderer()->frame()->inputMethodController().customCompositionUnderlines();
size_t numUnderlines = underlines.size();
for (size_t index = 0; index < numUnderlines; ++index) {
const CompositionUnderline& underline = underlines[index];
if (underline.endOffset <= start())
// underline is completely before this run. This might be an underline that sits
// before the first run we draw, or underlines that were within runs we skipped
// due to truncation.
continue;
if (underline.startOffset <= end()) {
// underline intersects this run. Paint it.
paintCompositionUnderline(context, boxOrigin, underline);
if (underline.endOffset > end() + 1)
// underline also runs into the next run. Bail now, no more marker advancement.
break;
} else
// underline is completely after this run, bail. A later run will paint it.
break;
}
}
}
if (shouldRotate)
context->concatCTM(rotation(boxRect, Counterclockwise));
}
void InlineTextBox::selectionStartEnd(int& sPos, int& ePos)
{
int startPos, endPos;
if (renderer()->selectionState() == RenderObject::SelectionInside) {
startPos = 0;
endPos = textRenderer()->textLength();
} else {
textRenderer()->selectionStartEnd(startPos, endPos);
if (renderer()->selectionState() == RenderObject::SelectionStart)
endPos = textRenderer()->textLength();
else if (renderer()->selectionState() == RenderObject::SelectionEnd)
startPos = 0;
}
sPos = max(startPos - m_start, 0);
ePos = min(endPos - m_start, (int)m_len);
}
void alignSelectionRectToDevicePixels(FloatRect& rect)
{
float maxX = floorf(rect.maxX());
rect.setX(floorf(rect.x()));
rect.setWidth(roundf(maxX - rect.x()));
}
void InlineTextBox::paintSelection(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, Color textColor)
{
if (context->paintingDisabled())
return;
// See if we have a selection to paint at all.
int sPos, ePos;
selectionStartEnd(sPos, ePos);
if (sPos >= ePos)
return;
Color c = renderer()->selectionBackgroundColor();
if (!c.isValid() || !c.alpha())
return;
// If the text color ends up being the same as the selection background, invert the selection
// background.
if (textColor == c)
c = Color(0xff - c.red(), 0xff - c.green(), 0xff - c.blue());
GraphicsContextStateSaver stateSaver(*context);
updateGraphicsContext(context, c, c, 0); // Don't draw text at all!
// If the text is truncated, let the thing being painted in the truncation
// draw its own highlight.
int length = m_truncation != cNoTruncation ? m_truncation : m_len;
StringView string = textRenderer()->text().createView();
if (string.length() != static_cast<unsigned>(length) || m_start)
string.narrow(m_start, length);
StringBuilder charactersWithHyphen;
bool respectHyphen = ePos == length && hasHyphen();
TextRun textRun = constructTextRun(style, font, string, textRenderer()->textLength() - m_start, respectHyphen ? &charactersWithHyphen : 0);
if (respectHyphen)
ePos = textRun.length();
LayoutUnit selectionBottom = root()->selectionBottom();
LayoutUnit selectionTop = root()->selectionTopAdjustedForPrecedingBlock();
int deltaY = roundToInt(renderer()->style()->isFlippedLinesWritingMode() ? selectionBottom - logicalBottom() : logicalTop() - selectionTop);
int selHeight = max(0, roundToInt(selectionBottom - selectionTop));
FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
FloatRect clipRect(localOrigin, FloatSize(m_logicalWidth, selHeight));
alignSelectionRectToDevicePixels(clipRect);
context->clip(clipRect);
context->drawHighlightForText(font, textRun, localOrigin, selHeight, c, sPos, ePos);
}
void InlineTextBox::paintCompositionBackground(GraphicsContext* context, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, int startPos, int endPos)
{
int offset = m_start;
int sPos = max(startPos - offset, 0);
int ePos = min(endPos - offset, (int)m_len);
if (sPos >= ePos)
return;
GraphicsContextStateSaver stateSaver(*context);
Color c = Color(225, 221, 85);
updateGraphicsContext(context, c, c, 0); // Don't draw text at all!
int deltaY = renderer()->style()->isFlippedLinesWritingMode() ? selectionBottom() - logicalBottom() : logicalTop() - selectionTop();
int selHeight = selectionHeight();
FloatPoint localOrigin(boxOrigin.x(), boxOrigin.y() - deltaY);
context->drawHighlightForText(font, constructTextRun(style, font), localOrigin, selHeight, c, sPos, ePos);
}
static StrokeStyle textDecorationStyleToStrokeStyle(TextDecorationStyle decorationStyle)
{
StrokeStyle strokeStyle = SolidStroke;
switch (decorationStyle) {
case TextDecorationStyleSolid:
strokeStyle = SolidStroke;
break;
case TextDecorationStyleDouble:
strokeStyle = DoubleStroke;
break;
case TextDecorationStyleDotted:
strokeStyle = DottedStroke;
break;
case TextDecorationStyleDashed:
strokeStyle = DashedStroke;
break;
case TextDecorationStyleWavy:
strokeStyle = WavyStroke;
break;
}
return strokeStyle;
}
#if ENABLE(CSS3_TEXT)
static int computeUnderlineOffset(const TextUnderlinePosition underlinePosition, const FontMetrics& fontMetrics, const InlineTextBox* inlineTextBox, const int textDecorationThickness)
{
// Compute the gap between the font and the underline. Use at least one
// pixel gap, if underline is thick then use a bigger gap.
const int gap = max<int>(1, ceilf(textDecorationThickness / 2.0));
// According to the specification TextUnderlinePositionAuto should default to 'alphabetic' for horizontal text
// and to 'under Left' for vertical text (e.g. japanese). We support only horizontal text for now.
switch (underlinePosition) {
case TextUnderlinePositionAlphabetic:
case TextUnderlinePositionAuto:
return fontMetrics.ascent() + gap; // Position underline near the alphabetic baseline.
case TextUnderlinePositionUnder: {
// Position underline relative to the under edge of the lowest element's content box.
const float offset = inlineTextBox->root()->maxLogicalTop() - inlineTextBox->logicalTop();
if (offset > 0)
return inlineTextBox->logicalHeight() + gap + offset;
return inlineTextBox->logicalHeight() + gap;
}
}
ASSERT_NOT_REACHED();
return fontMetrics.ascent() + gap;
}
#endif // CSS3_TEXT
static void adjustStepToDecorationLength(float& step, float& controlPointDistance, float length)
{
ASSERT(step > 0);
if (length <= 0)
return;
unsigned stepCount = static_cast<unsigned>(length / step);
// Each Bezier curve starts at the same pixel that the previous one
// ended. We need to subtract (stepCount - 1) pixels when calculating the
// length covered to account for that.
float uncoveredLength = length - (stepCount * step - (stepCount - 1));
float adjustment = uncoveredLength / stepCount;
step += adjustment;
controlPointDistance += adjustment;
}
/*
* Draw one cubic Bezier curve and repeat the same pattern long the the decoration's axis.
* The start point (p1), controlPoint1, controlPoint2 and end point (p2) of the Bezier curve
* form a diamond shape:
*
* step
* |-----------|
*
* controlPoint1
* +
*
*
* . .
* . .
* . .
* (x1, y1) p1 + . + p2 (x2, y2) - <--- Decoration's axis
* . . |
* . . |
* . . | controlPointDistance
* |
* |
* + -
* controlPoint2
*
* |-----------|
* step
*/
static void strokeWavyTextDecoration(GraphicsContext* context, FloatPoint& p1, FloatPoint& p2, float strokeThickness)
{
context->adjustLineToPixelBoundaries(p1, p2, strokeThickness, context->strokeStyle());
Path path;
path.moveTo(p1);
// Distance between decoration's axis and Bezier curve's control points.
// The height of the curve is based on this distance. Use a minimum of 6 pixels distance since
// the actual curve passes approximately at half of that distance, that is 3 pixels.
// The minimum height of the curve is also approximately 3 pixels. Increases the curve's height
// as strockThickness increases to make the curve looks better.
float controlPointDistance = 3 * max<float>(2, strokeThickness);
// Increment used to form the diamond shape between start point (p1), control
// points and end point (p2) along the axis of the decoration. Makes the
// curve wider as strockThickness increases to make the curve looks better.
float step = 2 * max<float>(2, strokeThickness);
bool isVerticalLine = (p1.x() == p2.x());
if (isVerticalLine) {
ASSERT(p1.x() == p2.x());
float xAxis = p1.x();
float y1;
float y2;
if (p1.y() < p2.y()) {
y1 = p1.y();
y2 = p2.y();
} else {
y1 = p2.y();
y2 = p1.y();
}
adjustStepToDecorationLength(step, controlPointDistance, y2 - y1);
FloatPoint controlPoint1(xAxis + controlPointDistance, 0);
FloatPoint controlPoint2(xAxis - controlPointDistance, 0);
for (float y = y1; y + 2 * step <= y2;) {
controlPoint1.setY(y + step);
controlPoint2.setY(y + step);
y += 2 * step;
path.addBezierCurveTo(controlPoint1, controlPoint2, FloatPoint(xAxis, y));
}
} else {
ASSERT(p1.y() == p2.y());
float yAxis = p1.y();
float x1;
float x2;
if (p1.x() < p2.x()) {
x1 = p1.x();
x2 = p2.x();
} else {
x1 = p2.x();
x2 = p1.x();
}
adjustStepToDecorationLength(step, controlPointDistance, x2 - x1);
FloatPoint controlPoint1(0, yAxis + controlPointDistance);
FloatPoint controlPoint2(0, yAxis - controlPointDistance);
for (float x = x1; x + 2 * step <= x2;) {
controlPoint1.setX(x + step);
controlPoint2.setX(x + step);
x += 2 * step;
path.addBezierCurveTo(controlPoint1, controlPoint2, FloatPoint(x, yAxis));
}
}
context->setShouldAntialias(true);
context->strokePath(path);
}
void InlineTextBox::paintDecoration(GraphicsContext* context, const FloatPoint& boxOrigin, TextDecoration deco, TextDecorationStyle decorationStyle, const ShadowList* shadowList)
{
GraphicsContextStateSaver stateSaver(*context);
float textDecorationThickness = 1.f;
if (m_truncation == cFullTruncation)
return;
FloatPoint localOrigin = boxOrigin;
float width = m_logicalWidth;
if (m_truncation != cNoTruncation) {
width = toRenderText(renderer())->width(m_start, m_truncation, textPos(), isFirstLineStyle());
if (!isLeftToRightDirection())
localOrigin.move(m_logicalWidth - width, 0);
}
// Get the text decoration colors.
Color underline, overline, linethrough;
renderer()->getTextDecorationColors(deco, underline, overline, linethrough, true);
if (isFirstLineStyle())
renderer()->getTextDecorationColors(deco, underline, overline, linethrough, true, true);
// Use a special function for underlines to get the positioning exactly right.
bool isPrinting = textRenderer()->document().printing();
bool linesAreOpaque = !isPrinting && (!(deco & TextDecorationUnderline) || underline.alpha() == 255) && (!(deco & TextDecorationOverline) || overline.alpha() == 255) && (!(deco & TextDecorationLineThrough) || linethrough.alpha() == 255);
RenderStyle* styleToUse = renderer()->style(isFirstLineStyle());
int baseline = styleToUse->fontMetrics().ascent();
size_t shadowCount = shadowList ? shadowList->shadows().size() : 0;
// Set the thick of the line to be 10% (or something else ?)of the computed font size and not less than 1px.
// Using computedFontSize should take care of zoom as well.
textDecorationThickness = max(textDecorationThickness, styleToUse->computedFontSize() / 10.0f);
context->setStrokeThickness(textDecorationThickness);
int extraOffset = 0;
if (!linesAreOpaque && shadowCount > 1) {
FloatRect clipRect(localOrigin, FloatSize(width, baseline + 2));
for (size_t i = shadowCount; i--; ) {
const ShadowData& s = shadowList->shadows()[i];
FloatRect shadowRect(localOrigin, FloatSize(width, baseline + 2));
shadowRect.inflate(s.blur());
int shadowX = isHorizontal() ? s.x() : s.y();
int shadowY = isHorizontal() ? s.y() : -s.x();
shadowRect.move(shadowX, shadowY);
clipRect.unite(shadowRect);
extraOffset = max(extraOffset, max(0, shadowY) + s.blur());
}
context->clip(clipRect);
extraOffset += baseline + 2;
localOrigin.move(0, extraOffset);
}
for (size_t i = max(static_cast<size_t>(1), shadowCount); i--; ) {
// Even if we have no shadows, we still want to run the code below this once.
if (i < shadowCount) {
if (!i) {
// The last set of lines paints normally inside the clip.
localOrigin.move(0, -extraOffset);
extraOffset = 0;
}
const ShadowData& shadow = shadowList->shadows()[i];
int shadowX = isHorizontal() ? shadow.x() : shadow.y();
int shadowY = isHorizontal() ? shadow.y() : -shadow.x();
context->setShadow(FloatSize(shadowX, shadowY - extraOffset), shadow.blur(), shadow.color());
}
// Offset between lines - always non-zero, so lines never cross each other.
float doubleOffset = textDecorationThickness + 1.f;
context->setStrokeStyle(textDecorationStyleToStrokeStyle(decorationStyle));
if (deco & TextDecorationUnderline) {
context->setStrokeColor(underline);
#if ENABLE(CSS3_TEXT)
TextUnderlinePosition underlinePosition = styleToUse->textUnderlinePosition();
const int underlineOffset = computeUnderlineOffset(underlinePosition, styleToUse->fontMetrics(), this, textDecorationThickness);
#else
const int underlineOffset = styleToUse->fontMetrics().ascent() + max<int>(1, ceilf(textDecorationThickness / 2.0));
#endif // CSS3_TEXT
switch (decorationStyle) {
case TextDecorationStyleWavy: {
FloatPoint start(localOrigin.x(), localOrigin.y() + underlineOffset + doubleOffset);
FloatPoint end(localOrigin.x() + width, localOrigin.y() + underlineOffset + doubleOffset);
strokeWavyTextDecoration(context, start, end, textDecorationThickness);
break;
}
default:
context->drawLineForText(FloatPoint(localOrigin.x(), localOrigin.y() + underlineOffset), width, isPrinting);
if (decorationStyle == TextDecorationStyleDouble)
context->drawLineForText(FloatPoint(localOrigin.x(), localOrigin.y() + underlineOffset + doubleOffset), width, isPrinting);
}
}
if (deco & TextDecorationOverline) {
context->setStrokeColor(overline);
switch (decorationStyle) {
case TextDecorationStyleWavy: {
FloatPoint start(localOrigin.x(), localOrigin.y() - doubleOffset);
FloatPoint end(localOrigin.x() + width, localOrigin.y() - doubleOffset);
strokeWavyTextDecoration(context, start, end, textDecorationThickness);
break;
}
default:
context->drawLineForText(localOrigin, width, isPrinting);
if (decorationStyle == TextDecorationStyleDouble)
context->drawLineForText(FloatPoint(localOrigin.x(), localOrigin.y() - doubleOffset), width, isPrinting);
}
}
if (deco & TextDecorationLineThrough) {
context->setStrokeColor(linethrough);
switch (decorationStyle) {
case TextDecorationStyleWavy: {
FloatPoint start(localOrigin.x(), localOrigin.y() + 2 * baseline / 3);
FloatPoint end(localOrigin.x() + width, localOrigin.y() + 2 * baseline / 3);
strokeWavyTextDecoration(context, start, end, textDecorationThickness);
break;
}
default:
context->drawLineForText(FloatPoint(localOrigin.x(), localOrigin.y() + 2 * baseline / 3), width, isPrinting);
if (decorationStyle == TextDecorationStyleDouble)
context->drawLineForText(FloatPoint(localOrigin.x(), localOrigin.y() + doubleOffset + 2 * baseline / 3), width, isPrinting);
}
}
}
}
static GraphicsContext::DocumentMarkerLineStyle lineStyleForMarkerType(DocumentMarker::MarkerType markerType)
{
switch (markerType) {
case DocumentMarker::Spelling:
return GraphicsContext::DocumentMarkerSpellingLineStyle;
case DocumentMarker::Grammar:
return GraphicsContext::DocumentMarkerGrammarLineStyle;
default:
ASSERT_NOT_REACHED();
return GraphicsContext::DocumentMarkerSpellingLineStyle;
}
}
void InlineTextBox::paintDocumentMarker(GraphicsContext* pt, const FloatPoint& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font, bool grammar)
{
// Never print spelling/grammar markers (5327887)
if (textRenderer()->document().printing())
return;
if (m_truncation == cFullTruncation)
return;
float start = 0; // start of line to draw, relative to tx
float width = m_logicalWidth; // how much line to draw
// Determine whether we need to measure text
bool markerSpansWholeBox = true;
if (m_start <= (int)marker->startOffset())
markerSpansWholeBox = false;
if ((end() + 1) != marker->endOffset()) // end points at the last char, not past it
markerSpansWholeBox = false;
if (m_truncation != cNoTruncation)
markerSpansWholeBox = false;
if (!markerSpansWholeBox || grammar) {
int startPosition = max<int>(marker->startOffset() - m_start, 0);
int endPosition = min<int>(marker->endOffset() - m_start, m_len);
if (m_truncation != cNoTruncation)
endPosition = min<int>(endPosition, m_truncation);
// Calculate start & width
int deltaY = renderer()->style()->isFlippedLinesWritingMode() ? selectionBottom() - logicalBottom() : logicalTop() - selectionTop();
int selHeight = selectionHeight();
FloatPoint startPoint(boxOrigin.x(), boxOrigin.y() - deltaY);
TextRun run = constructTextRun(style, font);
// FIXME: Convert the document markers to float rects.
IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, startPoint, selHeight, startPosition, endPosition));
start = markerRect.x() - startPoint.x();
width = markerRect.width();
// Store rendered rects for bad grammar markers, so we can hit-test against it elsewhere in order to
// display a toolTip. We don't do this for misspelling markers.
if (grammar) {
markerRect.move(-boxOrigin.x(), -boxOrigin.y());
markerRect = renderer()->localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox();
toRenderedDocumentMarker(marker)->setRenderedRect(markerRect);
}
}
// IMPORTANT: The misspelling underline is not considered when calculating the text bounds, so we have to
// make sure to fit within those bounds. This means the top pixel(s) of the underline will overlap the
// bottom pixel(s) of the glyphs in smaller font sizes. The alternatives are to increase the line spacing (bad!!)
// or decrease the underline thickness. The overlap is actually the most useful, and matches what AppKit does.
// So, we generally place the underline at the bottom of the text, but in larger fonts that's not so good so
// we pin to two pixels under the baseline.
int lineThickness = misspellingLineThickness;
int baseline = renderer()->style(isFirstLineStyle())->fontMetrics().ascent();
int descent = logicalHeight() - baseline;
int underlineOffset;
if (descent <= (2 + lineThickness)) {
// Place the underline at the very bottom of the text in small/medium fonts.
underlineOffset = logicalHeight() - lineThickness;
} else {
// In larger fonts, though, place the underline up near the baseline to prevent a big gap.
underlineOffset = baseline + 2;
}
pt->drawLineForDocumentMarker(FloatPoint(boxOrigin.x() + start, boxOrigin.y() + underlineOffset), width, lineStyleForMarkerType(marker->type()));
}
void InlineTextBox::paintTextMatchMarker(GraphicsContext* pt, const FloatPoint& boxOrigin, DocumentMarker* marker, RenderStyle* style, const Font& font)
{
// Use same y positioning and height as for selection, so that when the selection and this highlight are on
// the same word there are no pieces sticking out.
int deltaY = renderer()->style()->isFlippedLinesWritingMode() ? selectionBottom() - logicalBottom() : logicalTop() - selectionTop();
int selHeight = selectionHeight();
int sPos = max(marker->startOffset() - m_start, (unsigned)0);
int ePos = min(marker->endOffset() - m_start, (unsigned)m_len);
TextRun run = constructTextRun(style, font);
// Always compute and store the rect associated with this marker. The computed rect is in absolute coordinates.
IntRect markerRect = enclosingIntRect(font.selectionRectForText(run, IntPoint(x(), selectionTop()), selHeight, sPos, ePos));
markerRect = renderer()->localToAbsoluteQuad(FloatRect(markerRect)).enclosingBoundingBox();
toRenderedDocumentMarker(marker)->setRenderedRect(markerRect);
// Optionally highlight the text
if (renderer()->frame()->editor().markedTextMatchesAreHighlighted()) {
Color color = marker->activeMatch() ?
RenderTheme::theme().platformActiveTextSearchHighlightColor() :
RenderTheme::theme().platformInactiveTextSearchHighlightColor();
GraphicsContextStateSaver stateSaver(*pt);
updateGraphicsContext(pt, color, color, 0); // Don't draw text at all!
pt->clip(FloatRect(boxOrigin.x(), boxOrigin.y() - deltaY, m_logicalWidth, selHeight));
pt->drawHighlightForText(font, run, FloatPoint(boxOrigin.x(), boxOrigin.y() - deltaY), selHeight, color, sPos, ePos);
}
}
void InlineTextBox::paintDocumentMarkers(GraphicsContext* pt, const FloatPoint& boxOrigin, RenderStyle* style, const Font& font, bool background)
{
if (!renderer()->node())
return;
Vector<DocumentMarker*> markers = renderer()->document().markers()->markersFor(renderer()->node());
Vector<DocumentMarker*>::const_iterator markerIt = markers.begin();
// Give any document markers that touch this run a chance to draw before the text has been drawn.
// Note end() points at the last char, not one past it like endOffset and ranges do.
for ( ; markerIt != markers.end(); markerIt++) {
DocumentMarker* marker = *markerIt;
// Paint either the background markers or the foreground markers, but not both
switch (marker->type()) {
case DocumentMarker::Grammar:
case DocumentMarker::Spelling:
if (background)
continue;
break;
case DocumentMarker::TextMatch:
if (!background)
continue;
break;
default:
continue;
}
if (marker->endOffset() <= start())
// marker is completely before this run. This might be a marker that sits before the
// first run we draw, or markers that were within runs we skipped due to truncation.
continue;
if (marker->startOffset() > end())
// marker is completely after this run, bail. A later run will paint it.
break;
// marker intersects this run. Paint it.
switch (marker->type()) {
case DocumentMarker::Spelling:
paintDocumentMarker(pt, boxOrigin, marker, style, font, false);
break;
case DocumentMarker::Grammar:
paintDocumentMarker(pt, boxOrigin, marker, style, font, true);
break;
case DocumentMarker::TextMatch:
paintTextMatchMarker(pt, boxOrigin, marker, style, font);
break;
default:
ASSERT_NOT_REACHED();
}
}
}
void InlineTextBox::paintCompositionUnderline(GraphicsContext* ctx, const FloatPoint& boxOrigin, const CompositionUnderline& underline)
{
if (m_truncation == cFullTruncation)
return;
float start = 0; // start of line to draw, relative to tx
float width = m_logicalWidth; // how much line to draw
bool useWholeWidth = true;
unsigned paintStart = m_start;
unsigned paintEnd = end() + 1; // end points at the last char, not past it
if (paintStart <= underline.startOffset) {
paintStart = underline.startOffset;
useWholeWidth = false;
start = toRenderText(renderer())->width(m_start, paintStart - m_start, textPos(), isFirstLineStyle());
}
if (paintEnd != underline.endOffset) { // end points at the last char, not past it
paintEnd = min(paintEnd, (unsigned)underline.endOffset);
useWholeWidth = false;
}
if (m_truncation != cNoTruncation) {
paintEnd = min(paintEnd, (unsigned)m_start + m_truncation);
useWholeWidth = false;
}
if (!useWholeWidth) {
width = toRenderText(renderer())->width(paintStart, paintEnd - paintStart, textPos() + start, isFirstLineStyle());
}
// Thick marked text underlines are 2px thick as long as there is room for the 2px line under the baseline.
// All other marked text underlines are 1px thick.
// If there's not enough space the underline will touch or overlap characters.
int lineThickness = 1;
int baseline = renderer()->style(isFirstLineStyle())->fontMetrics().ascent();
if (underline.thick && logicalHeight() - baseline >= 2)
lineThickness = 2;
// We need to have some space between underlines of subsequent clauses, because some input methods do not use different underline styles for those.
// We make each line shorter, which has a harmless side effect of shortening the first and last clauses, too.
start += 1;
width -= 2;
ctx->setStrokeColor(underline.color);
ctx->setStrokeThickness(lineThickness);
ctx->drawLineForText(FloatPoint(boxOrigin.x() + start, boxOrigin.y() + logicalHeight() - lineThickness), width, textRenderer()->document().printing());
}
int InlineTextBox::caretMinOffset() const
{
return m_start;
}
int InlineTextBox::caretMaxOffset() const
{
return m_start + m_len;
}
float InlineTextBox::textPos() const
{
// When computing the width of a text run, RenderBlock::computeInlineDirectionPositionsForLine() doesn't include the actual offset
// from the containing block edge in its measurement. textPos() should be consistent so the text are rendered in the same width.
if (logicalLeft() == 0)
return 0;
return logicalLeft() - root()->logicalLeft();
}
int InlineTextBox::offsetForPosition(float lineOffset, bool includePartialGlyphs) const
{
if (isLineBreak())
return 0;
if (lineOffset - logicalLeft() > logicalWidth())
return isLeftToRightDirection() ? len() : 0;
if (lineOffset - logicalLeft() < 0)
return isLeftToRightDirection() ? 0 : len();
FontCachePurgePreventer fontCachePurgePreventer;
RenderText* text = toRenderText(renderer());
RenderStyle* style = text->style(isFirstLineStyle());
const Font& font = style->font();
return font.offsetForPosition(constructTextRun(style, font), lineOffset - logicalLeft(), includePartialGlyphs);
}
float InlineTextBox::positionForOffset(int offset) const
{
ASSERT(offset >= m_start);
ASSERT(offset <= m_start + m_len);
if (isLineBreak())
return logicalLeft();
FontCachePurgePreventer fontCachePurgePreventer;
RenderText* text = toRenderText(renderer());
RenderStyle* styleToUse = text->style(isFirstLineStyle());
ASSERT(styleToUse);
const Font& font = styleToUse->font();
int from = !isLeftToRightDirection() ? offset - m_start : 0;
int to = !isLeftToRightDirection() ? m_len : offset - m_start;
// FIXME: Do we need to add rightBearing here?
return font.selectionRectForText(constructTextRun(styleToUse, font), IntPoint(logicalLeft(), 0), 0, from, to).maxX();
}
bool InlineTextBox::containsCaretOffset(int offset) const
{
// Offsets before the box are never "in".
if (offset < m_start)
return false;
int pastEnd = m_start + m_len;
// Offsets inside the box (not at either edge) are always "in".
if (offset < pastEnd)
return true;
// Offsets outside the box are always "out".
if (offset > pastEnd)
return false;
// Offsets at the end are "out" for line breaks (they are on the next line).
if (isLineBreak())
return false;
// Offsets at the end are "in" for normal boxes (but the caller has to check affinity).
return true;
}
void InlineTextBox::characterWidths(Vector<float>& widths) const
{
FontCachePurgePreventer fontCachePurgePreventer;
RenderText* textObj = textRenderer();
RenderStyle* styleToUse = textObj->style(isFirstLineStyle());
const Font& font = styleToUse->font();
TextRun textRun = constructTextRun(styleToUse, font);
GlyphBuffer glyphBuffer;
WidthIterator it(&font, textRun);
float lastWidth = 0;
widths.resize(m_len);
for (unsigned i = 0; i < m_len; i++) {
it.advance(i + 1, &glyphBuffer);
widths[i] = it.m_runWidthSoFar - lastWidth;
lastWidth = it.m_runWidthSoFar;
}
}
TextRun InlineTextBox::constructTextRun(RenderStyle* style, const Font& font, StringBuilder* charactersWithHyphen) const
{
ASSERT(style);
RenderText* textRenderer = this->textRenderer();
ASSERT(textRenderer);
ASSERT(textRenderer->text());
StringView string = textRenderer->text().createView();
unsigned startPos = start();
unsigned length = len();
if (string.length() != length || startPos)
string.narrow(startPos, length);
return constructTextRun(style, font, string, textRenderer->textLength() - startPos, charactersWithHyphen);
}
TextRun InlineTextBox::constructTextRun(RenderStyle* style, const Font& font, StringView string, int maximumLength, StringBuilder* charactersWithHyphen) const
{
ASSERT(style);
RenderText* textRenderer = this->textRenderer();
ASSERT(textRenderer);
if (charactersWithHyphen) {
const AtomicString& hyphenString = style->hyphenString();
charactersWithHyphen->reserveCapacity(string.length() + hyphenString.length());
charactersWithHyphen->append(string);
charactersWithHyphen->append(hyphenString);
string = charactersWithHyphen->toString().createView();
maximumLength = string.length();
}
ASSERT(maximumLength >= static_cast<int>(string.length()));
TextRun run(string, textPos(), expansion(), expansionBehavior(), direction(), dirOverride() || style->rtlOrdering() == VisualOrder, !textRenderer->canUseSimpleFontCodePath());
run.setTabSize(!style->collapseWhiteSpace(), style->tabSize());
if (textRunNeedsRenderingContext(font))
run.setRenderingContext(SVGTextRunRenderingContext::create(textRenderer));
// Propagate the maximum length of the characters buffer to the TextRun, even when we're only processing a substring.
run.setCharactersLength(maximumLength);
ASSERT(run.charactersLength() >= run.length());
return run;
}
TextRun InlineTextBox::constructTextRunForInspector(RenderStyle* style, const Font& font) const
{
return InlineTextBox::constructTextRun(style, font);
}
#ifndef NDEBUG
const char* InlineTextBox::boxName() const
{
return "InlineTextBox";
}
void InlineTextBox::showBox(int printedCharacters) const
{
const RenderText* obj = toRenderText(renderer());
String value = obj->text();
value = value.substring(start(), len());
value.replaceWithLiteral('\\', "\\\\");
value.replaceWithLiteral('\n', "\\n");
printedCharacters += fprintf(stderr, "%s\t%p", boxName(), this);
for (; printedCharacters < showTreeCharacterOffset; printedCharacters++)
fputc(' ', stderr);
printedCharacters = fprintf(stderr, "\t%s %p", obj->renderName(), obj);
const int rendererCharacterOffset = 24;
for (; printedCharacters < rendererCharacterOffset; printedCharacters++)
fputc(' ', stderr);
fprintf(stderr, "(%d,%d) \"%s\"\n", start(), start() + len(), value.utf8().data());
}
#endif
} // namespace WebCore